Hand-operated apparatus for rotating drills or other rotary tools or implements.



HANDOPEBATED APPARATUS FOR ROTATING DRIJL'LS-OR OTHERROTARY TODQS 0RIMPLEMENTS.

' APPLICATION HLED AUG-'28. 19H.

Patented Feb. 26,1918.

ALLAN RISK, OF NEW'CASTLE-UPQN-TYNE, ENGLAND.

HAND-OPERATED APPARATUS FOR ROTATING DRILLS OR OTHER ROTARY TOOLS ORIMPLEMENTS.

Specification of Letters Patent.

Patented Feb. 26, 1913...

Application filed August 28, 1917. Serial No. 188,586.

To all whom it may concern:

Be it known that I, ALLAN RIsK, a subject of the King of Great Britainand Ireland, and resident of Heaton, Newcastleup0n-Tyne, England,engineer, have invented certain new and useful Improvements inHand-Operated Apparatus for Rotating Drills or other Rotary Tools orImplements, of which the following is a specification.

This invention relates to hand-operated drill mechanism.

Apparatus made in accordance with this invention comprises two memberspivoted together and adapted to be held in one hand and to be movedangularly in respect of one another, a rotary spindle disposed on onemember, and means for rotating the spindle when the pivoted members aremoved toward one another.

I will fully describe my invention with reference to the accompanyingdrawings wherein Figure 1 is a front elevation of one construction ofapparatus embodying my invention;

Fig. 2 is a view looking on the righthand side of Fig. 1; and

Fig. 3 is a part similar view to Fig. 1 showing another position of theoperating rack.

Referring to the drawings, the embodiment of my invention thereinillustrated comprises two members a and b pivoted together at a, onemember a being an arm carrying a sector cl and the other member, 72, ahollow rod, the axis of the pivot 0 being the center from whichthesector (Z is struck. The hollow rod 7) is provided with a thumb-piece eand is adapted to receive a spindle f which projects from each endthereof. The spindle f is free to rotate in the hollow rod 6 and isprovided with a flywheel g mounted within a frame r carried by thehollow rod 6. On the spindle f is fixed a pinion h which is engaged by acurved rack j carried by a plate j attached to the sector at, anylateral movement of said pinion except in a direction parallel to therack j being prevented by a pin 8 projecting rearwardly from the foot ofthe rod 6 engaging a curved slot is in the sector (Z. The spindle f isprovided with a chuck m at its outer end adapted to receive and hold adrill or other rotary tool or implement. The sector d is provided with aslot or finger piece a at one end. The end of the hollow rod 6 oppositeto that from which the spindle projects is provided with a head of cap79.

The plate j whereby the segmental rack 5 18 carried is provided withpins 6 the rear ends of which pass through parallel slots d in thesector (Z so that said rack is capahand, the thumb fitting into thethumb-,

piece 6 on the hollow rod 6 while one or more of the fingers are passedthrough or placed in the slot or finger piece it of the sector. Byalternately closing and opening the hand the arm a carrying the sectorat and rack 7' is caused to swing to and fro about the pivot c, the rackco-acting with the pinion h during the closing of the hand, that is thepower stroke, to rotate the spindle f and the drill or the like carriedthereby. During oscillation of the sector d and rack 7', when theabutment 1.0 on the plate it comes into contact with the shoulder y onone side of the hollow arm 5, the plate a is moved to the left and theco-action of its oblique grooves 7) with the pins t of the rack plate y"causes said rack plate to move radially outward, as shown in Fig. 3, todisengage the rack j with the pinion it. The momentum of the flywheel gcontinues to rotate the spindle f while the operators hand is opening.011 the return stroke, when the shoulder 3 on the other side of thehollow arm Z) comes into contact with the abutment e on the plate a thisplate is moved over to the right and the co-action of its obliquegrooves r with the pins t of the rack plate y" causes said rack plate tomove radially inward again and rengage the rack with the pinion it readyfor the next working stroke. In this way the direction of rotation ofthe spindle 7 is not reversed, the flywheel having sufficient momentumto keep the spindle rotating when the pinion is disengaged from therack. It

the work can usually be put upon the drill by the operating hand, but,if necessary, additional pressure in an axial direction can be put uponthe drill by pressing with position of its aXis can be moved nearer toor farther away from'the rack j. Or a series of interchangeable racksmay be provided. r

What'I claim and desire to secure by Letters Patent is A drillcomprising two members pivoted together and. adapted to be held in onehand and to be moved angularly in respect of one another, a rotaryspindle disposed on one member, and having a toothed pinion, flywheeland tool holder on said spindle, a segmental rack disposed on the othermember adapted to engage the said pinion, means for bringing the pinionand rack into engagement with one another prior to making the powerstroke, and means for bringing the pinion and rack out of ena 'einentafter the ower stroke all constructed and operating as herein set forth.Intestimony whereof I have signed my name to this specification.

ALLAN RISK.

WVitnesses to the signature of Allan Risk:

HENRY R. PUTMAN, BERTHA PUTMAN.

Copies ofthis patent may be obtained for five cents each. by addressingthe Commissioner of Patents,

' Washington, D. G.

